標籤:des android style blog http io ar color os
轉載地址:http://blog.csdn.net/spring21st/article/details/6730283
由於Android應用沒有像web開發中的session機制,所以採用PHPSESSID的方式,是沒有辦法擷取用戶端登入狀態的。
這種情況下,如何在使用者登入後,伺服器端擷取使用者登入狀態並保持,就必須採用一種“握手”的方式。
每個手機都有自己的IMEI號,那麼能不能通過這個標識去做認證呢?
經過實驗,答案是可以!
用戶端在請求伺服器端的時候,請求參數為 IMEI (param 1)及 IMEI&UA (param 2)經過加密的字串;伺服器端對用戶端傳遞的兩個參數進行解密,比對兩個IMEI值是否相同。如果相同,返回token給用戶端,以後每次用戶端請求伺服器端的時候,都攜帶該token。這樣伺服器就可以擷取使用者登入狀態了。
這裡,我採用的DES加密的方式,由於PHP和Java的DES加密是有差異的,所以單獨進行處理:
import java.security.Key; import java.security.SecureRandom; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; import com.sun.org.apache.xml.internal.security.utils.Base64; public class Des2 { public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding"; /** * DES演算法,加密 * * @param data 待加密字串 * @param key 加密私密金鑰,長度不能夠小於8位 * @return 加密後的位元組數組,一般結合Base64編碼使用 * @throws CryptException 異常 */ public static String encode(String key,String data) throws Exception { return encode(key, data.getBytes()); } /** * DES演算法,加密 * * @param data 待加密字串 * @param key 加密私密金鑰,長度不能夠小於8位 * @return 加密後的位元組數組,一般結合Base64編碼使用 * @throws CryptException 異常 */ public static String encode(String key,byte[] data) throws Exception { try { DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //key的長度不能夠小於8位位元組 Key secretKey = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance(ALGORITHM_DES); IvParameterSpec iv = new IvParameterSpec("12345678".getBytes()); AlgorithmParameterSpec paramSpec = iv; cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec); byte[] bytes = cipher.doFinal(data); return Base64.encode(bytes); } catch (Exception e) { throw new Exception(e); } } /** * DES演算法,解密 * * @param data 待解密字串 * @param key 解密私密金鑰,長度不能夠小於8位 * @return 解密後的位元組數組 * @throws Exception 異常 */ public static byte[] decode(String key,byte[] data) throws Exception { try { SecureRandom sr = new SecureRandom(); DESKeySpec dks = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); //key的長度不能夠小於8位位元組 Key secretKey = keyFactory.generateSecret(dks); Cipher cipher = Cipher.getInstance(ALGORITHM_DES); IvParameterSpec iv = new IvParameterSpec("12345678".getBytes()); AlgorithmParameterSpec paramSpec = iv; cipher.init(Cipher.DECRYPT_MODE, secretKey,paramSpec); return cipher.doFinal(data); } catch (Exception e) { throw new Exception(e); } } /** * 擷取編碼後的值 * @param key * @param data * @return * @throws Exception */ public static String decodeValue(String key,String data) { byte[] datas; String value = null; try { if(System.getProperty("os.name") != null && (System.getProperty("os.name").equalsIgnoreCase("sunos") || System.getProperty("os.name").equalsIgnoreCase("linux"))) { datas = decode(key, Base64.decode(data)); } else { datas = decode(key, Base64.decode(data)); } value = new String(datas); } catch (Exception e) { value = ""; } return value; } /** * test * @param key : 12345678 */ public static void main(String[] args) throws Exception { System.out.println("明:cychai ;密:" + Des2.encode("12345678","cychai")); } }
PHP:
class DES { var $key; var $iv; //位移量 function DES($key, $iv=0) { $this->key = $key; if($iv == 0) { $this->iv = $key; } else { $this->iv = $iv; } } //加密 function encrypt($str) { $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC ); $str = $this->pkcs5Pad ( $str, $size ); $data=mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_ENCRYPT, $this->iv); //$data=strtoupper(bin2hex($data)); //返回大寫十六進位字串 return base64_encode($data); } //解密 function decrypt($str) { $str = base64_decode ($str); //$strBin = $this->hex2bin( strtolower($str)); $str = mcrypt_cbc(MCRYPT_DES, $this->key, $str, MCRYPT_DECRYPT, $this->iv ); $str = $this->pkcs5Unpad( $str ); return $str; } function hex2bin($hexData) { $binData = ""; for($i = 0; $i < strlen ( $hexData ); $i += 2) { $binData .= chr(hexdec(substr($hexData, $i, 2))); } return $binData; } function pkcs5Pad($text, $blocksize) { $pad = $blocksize - (strlen ( $text ) % $blocksize); return $text . str_repeat ( chr ( $pad ), $pad ); } function pkcs5Unpad($text) { $pad = ord ( $text {strlen ( $text ) - 1} ); if ($pad > strlen ( $text )) return false; if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad) return false; return substr ( $text, 0, - 1 * $pad ); } } $str = ‘abc‘; $key= ‘12345678‘; $crypt = new DES($key); $mstr = $crypt->encrypt($str); $str = $crypt->decrypt($mstr); echo $str.‘ <=> ‘.$mstr;
Android用戶端與伺服器端通過DES加密認證